Business Green: The Executive Board of the UN’s Clean Development Mechanism (CDM) has this week agreed to strengthen many of the standards and procedures that govern the controversial carbon offset scheme in an attempt to better ensure that only credible emission reduction projects are allowed to take part. Following a scandal late last year that saw the CDM’s top project verifier, Det Norske Veritas (DNV), suspended from checking emission reduction initiatives after it uncovered flaws in its …